Ccsf
[医][=cerebrospinal fluid(drug)concentration]脑脊液（药物）浓度
🗣️ 情景例句
And guess what?
你们猜怎么着？
There is nothing worse than apathy.
哀莫大于心死。
Patience is a mark of confidence.
耐心是自信心的一种表现。